Folder Size Analyzer

See which folders and file types are using your disk space.

Free
No signup
Nothing uploaded
No watermark

Choose a folder

Read in this tab. Nothing is uploaded, and the page cannot see anything outside what you pick.

How to Use the Folder Size Analyzer Online

Folder Size Analyzer reads a folder you choose and shows where the space went: the biggest sub-folders with a bar against the total, and the top twenty file types by size. The answer is usually a surprise, and usually a handful of large videos, one runaway cache folder or a forgotten download rather than years of documents. Nothing is deleted; it shows, you decide.

Shows which folders and file types are using disk space. Almost always a surprise: the space is rarely where people assume, and it is usually a handful of large files or one runaway cache rather than accumulated documents.

No software to install Free Works on any device

Step-by-Step Guide to Using the Folder Size Analyzer

1

1. Choose a file or folder

It is read in this tab and never uploaded.
2

2. The result appears as soon as it has been read
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3. Copy or download whatever you need from it

Try it now

What is the Folder Size Analyzer?

At a glance

Takes: One folder, with everything beneath it
Shows: Biggest folders with size and a proportional bar
By type: The top 20 extensions by total size and file count
Total: The full size of everything read
Runs: In the page; no file contents are sent anywhere

Why Use File and Archive Tools?

A ZIP from a colleague, a download with no extension or a folder full of badly named files can stop work for a while. These tools unpack, identify, hash and rename files inside your browser, so nothing is uploaded to find out what it is.

“Know what a file is before you open it.”

Archives opened without software
Downloads checked with hashes
Duplicate files found
Big files packed smaller

Unknown files identified
Files renamed in bulk
Folders compared quickly
Contents never leave your computer

Popular Uses for ZIP and File Tools

These tools help with the small file puzzles that come up every week.

Opening RAR files See and extract what is inside an archive on a computer with no unzip program.
Checking a download Compare a file’s SHA-256 checksum with the one on the download page.
Mystery files Find the real type of a file that has lost its extension or has the wrong one.
Renaming photos Rename a folder of camera photos with dates or numbers in one go.
Clearing duplicates Find repeated files taking up space in a downloads or photos folder.
Sending many files Pack several documents into one ZIP so they travel as a single attachment.
Comparing folders See which files differ between a backup folder and the working copy.
Reading file details Check a file’s size, dates and hidden metadata before sharing it.

What You Can Do with the Folder Size Analyzer

Previews every rename before applying it, because a bulk rename is difficult to reverse

Duplicate detection compares content rather than names, so two copies with different names still match

Why Use ToolXkit for Folder Size Analyzer?

Your files stay with you

Everything runs inside your browser. Nothing you open or type is uploaded to a server.

Archive Tools for Different Users

Office workers

Open ZIP attachments and bundle reports together without extra software.

Developers

Check signatures, MIME types and hashes, and create TAR or GZIP files.

IT support staff

Identify strange files and verify downloads before installing anything on a machine.

Photographers

Rename shoots in bulk and find duplicates before backing up a card.

Students

Unpack course material and zip up project folders for submission.

Security-minded users

Check what a file really is before trusting its name or icon.

Best Times to Unpack or Check a File

File tools are useful when you are:

Opening an archive on a new computer
Verifying a software download
Stuck with a file that won’t open
Tidying a messy downloads folder
Emailing a folder of documents
Checking a backup is complete
Renaming lots of photos
Freeing space on a full drive

Tips and Good to Know

Pick one folder; the browser reads only what you choose, so a whole-drive scan is not possible here. Start with Downloads, Documents or Pictures.
Deleting has to happen in your file manager. The page has no permission to remove or move files, which is by design.
For a folder that is large because of copies, Duplicate File Finder tells you which files are exact repeats.

Frequently Asked Questions

Answers to common questions about this tool.

Do I need to install anything to use the Folder Size Analyzer?

No. Folder Size Analyzer runs entirely in your browser — there is nothing to download, no extension and no desktop program. It works the same on Windows, macOS, Linux, Android and iPhone.

Is it safe to use the Folder Size Analyzer online?

Safer than the usual alternative, yes. Most online tools upload your file to a server you know nothing about, where it sits until someone deletes it. Here the file never leaves your device — the processing happens in the page itself, so there is no server copy to leak, retain or sell.

What is a checksum and why check one?

A checksum is a short code worked out from a file’s contents. If your copy gives the same code as the one the publisher lists, the file arrived complete and unchanged.

Is there a size limit in Folder Size Analyzer?

It depends on your device rather than on the site. Everything is processed in memory in the browser, so a computer handles bigger archives and folders than a phone does.

Is Folder Size Analyzer free to use at work?

Yes. It is free for personal and work use with no account. Because files stay on the machine, it also fits workplaces that do not allow uploading documents to outside sites.

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